Abstract: The invention relates to a method for producing soybean flour consisting of soybeans. said method comprising the followving steps: a) the soybeans are husked to a husking degree of more than 97%; b) the husked soybeans are ground to a particle-size distribution whereby more than 60% of the soybean particles measures between 50 ?m and 0.5 mm and more than 30% of the soybean particles (fine part) measures less than 50 mm. by subjecting the same to a percussive force; c) an enzyme system of the soybean particles is deactivated and the soybean particles are agglomerated; and d) the agglomerates comprising the deactivated soybean particles are finely ground to a particle size distribution whereby at least 98% of the particles is smaller than 100 ?m by subjecting the agglomerates and the deactivated soybean particles thereof to shear forces.

Abstract: For the recovery of the protein from oil seeds, particularly from soy beans, grinding is effected under omission of a suspension liquid, i.e. substantially in dry condition of the oil seed, by applying pressure and friction until the cell walls of the oil seed are opened. This is preferably realized on a friction roller refiner comprising at least two rollers of different speed, i.e. for example on a three-roller-refiner, a five-roller-refiner or also at least two two-roller-refiners. Surprisingly, in this way the expenditure in energy is reduced and the quality of the product is improved.